So after the discussion above I spent the best part of yesterday (about 9 hours) experimenting with about 20 media files. I renamed them in all kinds of ways and the best format that worked (all 20 files matched properly) was the following:
A View to a Kill (1985).mkv
The worst was this - a.view.to.a.kill.mkv - it only matched 14 of the 20 correctly.
I deliberately chose files that I knew had different versions, I also chose files with odd names.
Friday the 13th (1980) was fine but when I added Friday the 13th Part 2 (1981) it got confused and tried to but both as the same title but with more than one part; understandable but not helpful, I tried renaming it to just Friday the 13th part2 (1981) and Friday the 13th PT2 (1981) but the one that worked the best was simply Friday the 13th (1981).
I hope this helps others.